>
>(The line is from (0,0) to (511, 211))
>
>ld iy,(0faf7h)
>ld ix,085h
>call 01ch
>
>There ara some things I don't understand:
>* the call 01ch is the way to call a routine in another slot.
Right ! He is calling the MSX2- sub rom, which contains MSX2 line drawing
routine !
>The
>specification of this routine says that the slot may be specified in the 8
>order bits of the iy register... why the iy register has been loaded with
>the content of the addres 0faf7??
0FF7 is MSX2 system variable (EXBRSA) containing the MSX2 subrom slot id.
>* Is the 085h the routine to draw a line? It isn't specified in the
>Technical Handbook.
Yes, it is !
>If it is, what are its parameters?
>* Why the calls are maked specifiing the number of the slot? Is to allow the
>call of the routine with different memory configurations? (from DOS or
>BASIC?)
Yes ! , but clling from dos is rther tricky !
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